[Interest] Conflicting libjpeg versions

Olivier B. perso.olivier.barthelemy at gmail.com
Tue Mar 29 17:06:15 CEST 2016


In that case it's at your app's link time that you have to make sure you
link to the same libjpeg qt used. If both Qt and your app use a static
libjpeg in the same executable, it must be the same

2016-03-29 17:00 GMT+02:00 Etienne Sandré-Chardonnal <etienne.sandre at m4x.org
>:

> I will try recompiling Qt. Is there any way to check the actual files Qt
> is linked against?
>
> I was not clear in my original post. The error message is not triggered
> when I use Qt for reading a jpeg, but when I'm directly using the libjpeg
> API.
>
> Etienne
>
> 2016-03-29 16:55 GMT+02:00 Olivier B. <perso.olivier.barthelemy at gmail.com>
> :
>
>> oops, ignore my 2nd sentence, i mixed up png and jpeg
>>
>> 2016-03-29 16:51 GMT+02:00 Olivier B. <perso.olivier.barthelemy at gmail.com
>> >:
>>
>>> I do -system-libjpeg -I ${ENV_LIBJPEG_PATH}/include -L
>>> ${ENV_LIBJPEG_PATH}/lib  on my configure line to use my own libjpeg
>>> version.
>>> I also sed in qtbase/src/3rdparty/png_dependency.pri between debug and
>>> release build, in order to use a debug libjpeg in my debug qt and a release
>>> libjpeg in my release qt
>>>
>>> If you build a static Qt, it is written in Qt static libs at qt build
>>> time that they need 62. But actual linking with libjpeg is done at link
>>> time of your exe. So if the path to the wrong libjpeg is passed at
>>> executable llink time, you might get the error you are seing at runtime
>>>
>>> 2016-03-29 16:45 GMT+02:00 Etienne Sandré-Chardonnal <
>>> etienne.sandre at m4x.org>:
>>>
>>>> Hi,
>>>>
>>>> There is no dependency to any libjpeg DLL, as checked with dependency
>>>> walker. And I have searched for any libjpeg*.dll in my system, none of them
>>>> are inside the PATH. The libjpeg is linked statically.
>>>>
>>>> Which options do I have for configuring Qt? I only know the option
>>>> which switches between embedded libjpeg and system libjpeg, and using the
>>>> latter should normally make Qt use the 6.2 that is installed in the
>>>> compiler folders (include/lib)
>>>>
>>>>
>>>>
>>>>
>>>> 2016-03-29 16:24 GMT+02:00 Olivier B. <
>>>> perso.olivier.barthelemy at gmail.com>:
>>>>
>>>>> Either your PATH is set so the wrong libjpeg dll is found first, or qt
>>>>> found the wrong jpeg include first.
>>>>> If you don't care which version is used, set your PATH so that your
>>>>> system libjpeg 6.2 is found first at runtime (or place the libjpeg dll of
>>>>> the version that was detected beside your executable). If you want a
>>>>> specific version, change qt configure options accordingly
>>>>>
>>>>> 2016-03-29 16:18 GMT+02:00 Etienne Sandré-Chardonnal <
>>>>> etienne.sandre at m4x.org>:
>>>>>
>>>>>> Dear all,
>>>>>>
>>>>>> I am compiling under windows with MinGW (64-bit)
>>>>>>
>>>>>> I compiled Qt for static linking. I let the default options for
>>>>>> configure regarding jpeg support, and it seems that it choose using the
>>>>>> system libjpeg (as seen in config.summary), probably because it detected
>>>>>> it. My system libjpeg is the binary shipped by libjpeg-turbo 1.4.2 official
>>>>>> download, installed inside minGW folders. The libjpeg version as in
>>>>>> jconfig.h is 62 (6.2)
>>>>>>
>>>>>> Now when I compile and run my application, libjpeg functions return
>>>>>> the following error message : Wrong JPEG library version: library is
>>>>>> 80, caller expects 62
>>>>>>
>>>>>> So it means that at some point my application was linked (statically
>>>>>> or dynamically) with libjpeg version 80 (8.0)
>>>>>>
>>>>>> If I remove the libjpeg.a from my compiler path, I cannot compile my
>>>>>> application anymore. So it is properly linking against that file, or I am
>>>>>> missing something.
>>>>>>
>>>>>> What could be the issue?
>>>>>>
>>>>>> Thanks...
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>
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